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Message: <blockquote data-quote="bopo668" data-source="post: 3533616" data-attributes="member: 576482"><p>would the port displacement for one 4" aero that is 20.5" long be .149 i was wondering if my math was right and another thing do i add that to my box and then do it again to figure out how long they need to be.idk im kinda confused my box is. 4.59 with sub displacement and i want 4 4" aeros tuned to 38 any help</p></blockquote><p></p>

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